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08-07.-2003, 04:45 AM
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#1 |
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Registered User
Join Date: May 2003
Location: montana
Posts: 117
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what ever happened to biopace?
remember that funky front chainring? it wasnt round.
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08-07.-2003, 04:51 AM
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#2 |
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Registered User
Join Date: Jun 2003
Location: Colorado USA
Posts: 43
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Yes I do remember it.....but have not seen it in a long time....went away, it was just a fad.
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08-07.-2003, 05:21 AM
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#3 |
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Guest
Posts: n/a
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'twas a set of elliptical chainrings. Probably achieved nothing in terms of improved biomechanics. I tried them in the mid 80's and didn't notice anything significant.
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16-07.-2003, 02:01 PM
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#4 |
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Junior Member
Join Date: Jul 2003
Posts: 2
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Biopace is still living in the backrooms of cycling shops all over the world where it was dumped by all the people who finally figured out why their knees hurt all the time!!!
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23-07.-2003, 02:10 AM
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#5 | |
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Registered User
Join Date: Jul 2003
Posts: 252
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Re: what ever happened to biopace?
Quote:
It wasn't round at all, and according to the marketing blurb, it wasn't elliptical either... Specifically, it was a "lobed" ellipsed that was supposed to increase efficiency in pedalling by varying the overall ratios during the full stroke according to some sort of biomechanical progression. My first mountain bike (years and years and YEARS ago) was a Univega Alpina Pro and it had the full Deore XT with the Biopace chainrings... The only difference I noticed over round rings was that I could accelerate more quickly than a comparable weight mountain bike in the same gear, but this does not take into account a multitude of other factors, but I always attributed it at least in small part to the Biopace design... I never developed any chronic problems from it, and in the end I think Shimano and others dropped the whole idea because the gainful return was insignificant (if anything) compared to the effort to produce... I remember speaking to an SAE engineer who was also a bike enthusiast, and he mentioned that the idea of the "non-round" chainrings was first tested sometime in the late 30's (nope, Shimano did not invent it  ) and even then, they decided that the advantages were small to insignificant and were overshadowed by manufacturing cost and added complexity and reduced reliability...Very small gains can actually be measured in very specific situations of a power downstroke, but on the flipside, it reduces effeciency during even less than perfect attempts at proper spinning... Have a good one! Feanor |
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25-07.-2003, 01:59 PM
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#6 |
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Registered User
Join Date: Jul 2003
Posts: 76
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It would be funny to put one on someones track bike!
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25-07.-2003, 09:24 PM
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#7 |
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Junior Member
Join Date: Jul 2003
Posts: 24
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fads!
reminds me of the old L-shaped cranks that were reputed to improve performance. i suspect the designer had very little understanding of the mechanics of a chainset |
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25-07.-2003, 09:24 PM
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#8 |
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Registered User
Join Date: Jul 2003
Location: Sandy Eggo, CA
Posts: 54
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Re: what ever happened to biopace?
The idea never went away. It's still around, but much higher-tech these days. --> Rotor Cranks.
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26-07.-2003, 09:26 AM
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#9 |
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Registered User
Join Date: Jul 2003
Posts: 836
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Had 'em on my '84 Nishiki Prestige back in the day. I never thought much about it, and when I switched to a diffent bike a few years later, I don't recall noticing any material change to power or spinning ability. The small ring looked really wacky!
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27-07.-2003, 12:15 PM
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#10 | |
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Registered User
Join Date: Jul 2003
Posts: 187
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Hey bro...I think I once owned that Nishiki. Did it have red and white chromoly tubes? Where did you buy it? I had some great rides on that Nishiki..which I purchased from a pawn shop for around 50.00. Maybe it was the very same one you once owned. Ya never know!
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28-07.-2003, 03:59 AM
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#11 |
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Member
Join Date: Jan 2003
Location: Cardiff, Wales
Posts: 95
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You can still get non-round chainrings, but they're oval. Weren't the Shimano ones square? Check out http://www.argonet.co.uk/highpath/cycle_/eggs.htm
for the full blurb.
__________________
drivers = smokers |
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28-07.-2003, 05:38 AM
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#12 |
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Registered User
Join Date: Jul 2003
Posts: 65
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i tihnk i have bioSpace chain rings.it was a triple but bent my smallest ring.its a univega cyclocross bike
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30-07.-2003, 04:57 AM
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#13 |
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Junior Member
Join Date: Jul 2003
Location: Amsterdam
Posts: 8
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biopace were rubbish and didnt work and no ammount of blurb will change that.
apparantly u need a particular eggring shape for every gear ratio depending on ur framsize and saddle height depending o the wind direction. |
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30-07.-2003, 06:11 AM
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#14 |
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Registered User
Join Date: Jul 2003
Posts: 65
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nm i looked at it after my ride,it is called bio pace.i thought it was called bio space.well i bent the small chainring out of the triple crankset.where can i get the chainring?
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30-07.-2003, 08:49 AM
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#15 |
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Junior Member
Join Date: Jul 2003
Location: Amsterdam
Posts: 8
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if u cant get a normal round ring to fit, this is possible if still available, get a new nice round chainset or just ask in the shop they probably have 100s of unused biopace ring theyll give u
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